Switch circuit, BMS, switch control method, battery system and electrical equipment

Abstract

To provide a switch circuit for a battery management system.SOLUTION: A switch circuit includes a power supply, a first switch K1, an isolated driving module, and a second switch K2. A first end of the first switch K1 is connected to the power supply, a second end of the first switch K1 is connected to an input end of the isolated driving module, the power supply feeds power to the isolated driving module by the first switch K1, a control end of the second switch K2 is connected to an output end of the isolated driving module, and the second switch K2 turns on / off in response to an output signal of the isolated driving module. The second switch K2 turns on in response to triggering of the first switch K1 under a first condition, the first condition is for commanding power on to a battery system, and / or the second switch K2 turns off in response to triggering of the first switch K1 under a second condition, and the second condition is for commanding power off to the battery system.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present application relates to the field of battery technology, and more particularly to a switch circuit, a battery management system, a switch control method, a battery system, and an electrical device. [Background technology]

[0002] In electrical equipment that can be powered by a battery system, such as a high-voltage energy storage system, a battery management system is usually used to manage the system. In the related art, for the convenience of control, in a high-voltage energy storage system, the power to the battery system is usually turned on and off by controlling a circuit breaker or a similar device. Summary of the Invention [Problem to be solved by the invention]

[0003] Due to safety considerations, circuit breakers or circuit breakers are usually only manually operated by professional maintenance personnel, and are not permitted to be operated by general users. This increases maintenance costs and makes control inconvenient. In response to this, the present embodiments provide a switch circuit, a battery management system, a switch control method, a battery system, and electrical equipment, and by arranging the switch circuit in the battery management system, the above-mentioned problems are resolved. [Means for solving the problem]

[0004] An embodiment of the present application is a switch circuit including a power supply, a first switch, an isolated driving module, and a second switch, wherein a first end of the first switch is electrically connected to the power supply, a second end of the first switch is electrically connected to an input end of the isolated driving module, the power supply is configured to supply power to the isolated driving module via the first switch, a control end of the second switch is electrically connected to an output end of the isolated driving module, and the second switch is configured to turn on and off in response to an output signal of the isolated driving module, wherein the second switch turns on in response to the first switch being triggered by a first condition, the first condition being for instructing a battery system to power on, and / or the second switch turns off in response to the first switch being triggered by a second condition, the second condition being for instructing the battery system to power off.

[0005] Based on the above switch circuit, control of the first switch K1 can be used to control the on / off of the second switch, thereby enabling the battery system to be powered on and off. Because the first switch and the second switch are isolated by an isolation drive module, when the above switch circuit is applied to high-voltage electrical equipment, only the second switch needs to be connected to the high-voltage battery, reducing the impact of the high voltage of the battery on the first switch. This allows a general switch device (e.g., a tactile switch) to be used as the first switch. Compared to a circuit breaker or a circuit breaker, the first switch can be operated by a general user, reducing maintenance costs and improving control convenience.

[0006] Furthermore, the switch circuit further includes a first unidirectional conducting device, a first end of the first unidirectional conducting device electrically connected to a second end of the first switch, and a second end of the first unidirectional conducting device electrically connected to an input end of the isolated driving module.

[0007] The first one-way conducting device can effectively prevent current from flowing back between the first switch and the isolation driving module, thereby improving the safety of the switch circuit.

[0008] Furthermore, a first end of the second switch is configured to be electrically connected to an input end of a power supply module, and a second end of the second switch is configured to be electrically connected to a positive terminal of a battery.

[0009] The first end of the second switch is configured to be electrically connected to the input end of the power supply module, and the second end of the second switch is configured to be electrically connected to the positive electrode of the battery, so that when the second switch is turned on, the power supply module can convert the voltage output by the battery into a power supply voltage for the switch circuit, and provide electrical energy to enable the second switch to remain on.

[0010] Furthermore, the switch circuit further includes a first voltage conversion device, wherein the input terminal of the first voltage conversion device is configured to be electrically connected to the output terminal of the power supply module, the output terminal of the first voltage conversion device is electrically connected to the input terminal of the isolated driving module, and the first voltage conversion device is configured to step down the output voltage of the power supply module.

[0011] The first voltage conversion device can convert the voltage output via the power supply module into a voltage that can be input to the isolated driving module, so that after the first switch is turned off, the second switch is driven to turn on, thereby maintaining the battery system in a power-on state.

[0012] Furthermore, the switch circuit further includes a voltage stabilizing device, and the voltage stabilizing device is electrically connected between the output terminal of the first voltage conversion device and the input terminal of the isolated driving module.

[0013] By installing a voltage stabilization device, the voltage input to the isolated driving module can be stabilized, thereby reducing the risk of the second switch being turned off incorrectly due to voltage jitter.

[0014] Furthermore, the switch circuit further includes a first latch, an input end of the first latch configured to be electrically connected to a microcontroller unit, and an output end of the first latch electrically connected to an enable pin of the voltage stabilizing device.

[0015] The first latch is set to keep the voltage stabilizing device operating, thereby maintaining the battery system in a power-on state. After the first switch is triggered by the second condition, the microcontroller controls the first latch to stop outputting the enable signal, so that the voltage stabilizing device stops operating, the first voltage conversion device no longer supplies power to the isolated driving module, and the second switch is turned off.

[0016] In addition, power interruption by a circuit breaker or a breaker is considered a forced power interruption. When power is interrupted, the battery management system is forced to shut down, which can cause data loss if the battery management system is unable to record the data in progress. However, in this embodiment, the second switch is turned off based on the control of the microcontroller, so the microcontroller saves the data before turning off, reducing the risk of data loss.

[0017] Furthermore, the switch circuit further includes a second unidirectional conducting device, a first end of the second unidirectional conducting device electrically connected to the output end of the voltage stabilizing device, and a second end of the second unidirectional conducting device electrically connected to the input end of the isolated driving module.

[0018] The second unidirectional conducting device can effectively prevent current from flowing back between the voltage stabilizing device and the isolated driving module, thereby improving the safety of the switch circuit.

[0019] Furthermore, the switch circuit further includes a second voltage conversion device, the input terminal of the second voltage conversion device is configured to be electrically connected to the output terminal of the power supply module, the output terminal of the second voltage conversion device is electrically connected to the input terminal of the isolated driving module, and the second voltage conversion device is configured to step down the output voltage of the power supply module.

[0020] A second voltage conversion device is installed, and the input terminal of the second voltage conversion device is configured to be electrically connected to the output terminal of the power supply module, and the output terminal of the second voltage conversion device is electrically connected to the input terminal of the isolated driving module, thereby forming a redundant circuit that supplies power to the isolated driving module.Even if one of the power supply circuits that supplies power to one of the isolated driving modules fails, the other power supply circuits can operate normally, improving the reliability of the switch circuit.

[0021] Furthermore, the switch circuit further includes a third switch, a first end of which is configured to be electrically connected to the output end of the power supply module, and a second end of which is electrically connected to the input end of the second voltage conversion device.

[0022] The third switch enables on / off control of the redundant circuit, improving the controllability of the switch circuit.

[0023] Furthermore, the switch circuit further includes a second latch, an input end of the second latch is configured to be electrically connected to a microcontroller unit, and an output end of the second latch is electrically connected to an enable pin of the third switch.

[0024] The second latch keeps the third switch on, thereby maintaining the battery system powered on. After the first switch is triggered by the second condition, the microcontroller controls the second latch to stop outputting the enable signal, turning off the third switch, and preventing the second voltage converter from supplying power to the isolated driving module. In addition, in this embodiment, the second switch is turned off under the control of the microcontroller, so that the microcontroller can save data before turning off the second switch, reducing the risk of data loss.

[0025] Furthermore, the switch circuit further includes a third unidirectional conducting device, a first end of the third unidirectional conducting device electrically connected to the output end of the second voltage conversion device, and a second end of the third unidirectional conducting device electrically connected to the input end of the isolated driving module.

[0026] Based on the above-mentioned implementation structure, by installing the third unidirectional conducting device, the current can be effectively prevented from flowing back between the second voltage conversion device and the isolated driving module, and the safety of the switch circuit can be improved.

[0027] Furthermore, the switch circuit further includes a power supply connection terminal, a third voltage conversion device, and a first isolated power supply, wherein the power supply connection terminal is configured to be electrically connected to the external power supply, the input end of the third voltage conversion device is electrically connected to the power supply connection terminal, the input end of the first isolated power supply is electrically connected to the output end of the third voltage conversion device, and the output end of the first isolated power supply is electrically connected to the input end of the isolated driving module.

[0028] The power connection terminal and the third voltage converter can access the external power source to realize the on control of the second switch, while the first isolated power source realizes isolation between the external power source and each electronic device in the switch circuit, thereby avoiding the risk of the switch circuit being burned out due to accessing an incompatible external power source.

[0029] Furthermore, the switch circuit further includes a fourth unidirectional conducting device, a first end of the fourth unidirectional conducting device electrically connected to the output end of the first isolated power source, and a second end of the fourth unidirectional conducting device electrically connected to the input end of the isolated driving module.

[0030] The fourth one-way conducting device can effectively prevent current from flowing back between the first isolated power source and the isolated driving module, thereby improving the safety of the switch circuit.

[0031] Furthermore, the switch circuit further includes a charging module, the input terminal of the charging module is electrically connected to the output terminal of the power supply module, and the output terminal of the charging module is electrically connected to the power supply.

[0032] By installing the charging module, after the second switch is turned on, the power source can be charged, and the first switch continues to control the second switch to be turned on.

[0033] Furthermore, the switch circuit further includes a current-limiting resistor, and is configured so that the current-limiting resistor is connected in series between the battery and the power supply module.

[0034] By providing a current-limiting resistor, the probability of an excessive current being generated after the battery is connected to the power module, which may cause device burnout, can be reduced, and the safety of the switch circuit can be improved.

[0035] Furthermore, the switch circuit further includes a fuse, and the fuse is disposed in a charge path and / or a discharge path of the battery system.

[0036] By providing a fuse in the charge path and / or discharge path of the battery system, the risk of the battery system being burned can be reduced, and the safety of the battery system can be improved.

[0037] Furthermore, the power source includes a supercapacitor and / or a button cell battery.

[0038] Furthermore, the first switch is a tactile switch, and the second switch is any one of a FET (Field Effect Transistor), an IGBT (Insulated Gate Bipolar Transistor), a relay, a photocoupler, and a transistor.

[0039] Using a tactile switch as the first switch allows the user to conveniently turn the first switch on and off, improving user convenience. Using a FET, IGBT, relay, photocoupler, or transistor as the second switch allows the second switch to be turned on and off based on the output of the isolated driving module, resulting in a simple structure and low cost, which is favorable for widespread use in industrial applications.

[0040] Furthermore, the isolated driving module includes a second isolated power supply and an isolated driving chip, the input end of the isolated driving module includes the input end of the second isolated power supply and the input end of the isolated driving chip, the output end of the isolated driving module includes the output end of the isolated driving chip, and the output end of the second isolated power supply is electrically connected to the power supply end of the isolated driving chip.

[0041] Since the second isolated power supply and the isolated driving chip both have the function of circuit isolation, they can isolate the electronic components located on the input side of the isolated driving module in the switch circuit from the battery. This reduces the risk of damage to the electronic components located on the input side of the isolated driving module when the switch circuit of this embodiment is applied to high-voltage scenarios such as high-voltage energy storage systems, improving the safety of the switch circuit. At the same time, the installation of the second isolated power supply can provide power to the isolated driving chip, allowing the isolated driving chip to operate normally.

[0042] Furthermore, the ground terminal of the second isolated power supply and the ground terminal of the isolated driving chip are both electrically connected to the first terminal of the second switch.

[0043] An embodiment of the present invention provides a BMS (Battery Management System) including any of the switch circuits described above.

[0044] In one possible embodiment, the battery management system further includes a microcontroller unit, and the switch circuit is the switch circuit of claim 6 or 10, wherein a power supply pin of the microcontroller unit is electrically connected to an output terminal of the first voltage conversion device, the microcontroller unit is further electrically connected to an input terminal of the first latch, and / or the microcontroller unit is further electrically connected to an input terminal of the second latch.

[0045] The microcontroller can control the first latch and / or the second latch, thereby controlling the continuous on / off of the second switch. In the present embodiment, the second switch is turned off based on the control of the microcontroller, so that the microcontroller can save data before turning off the second switch, thereby reducing the risk of data loss.

[0046] An embodiment of the present invention provides a switch control method applicable to any of the battery management systems described above, the method including: in response to the first switch being triggered by a first condition, the power source powers the isolated driving module; and the second switch is turned on in response to an output signal from the isolated driving module.

[0047] Furthermore, the battery management system is the battery management system in the above possible embodiment, and the method further includes, in response to the second switch being turned on, the microcontroller unit outputting a first control signal to the first latch, the first control signal being for instructing the first latch to output an enable signal to the voltage stabilizing device so that the first voltage conversion device supplies power to the isolated driving module through the voltage stabilizing device.

[0048] The microcontroller unit controls the first latch to keep the voltage stabilizing device operating, thereby keeping the battery system powered on. The control method is simple and reliable, which is advantageous for widespread use in industrial applications.

[0049] Furthermore, the switch control method further includes the microcontroller outputting a second control signal to the second latch in response to the second switch being turned on, the second control signal being for instructing the second latch to output an enable signal to the third switch so that the third switch is turned on and the second voltage conversion device supplies power to the isolated driving module.

[0050] The third switch is kept on, which keeps the battery system powered on, and the control method is simple and reliable, which is advantageous for widespread use in industrial applications. In addition, the second switch is turned off under the control of the microcontroller, so the microcontroller can save data before turning off, reducing the risk of data loss.

[0051] Furthermore, the switch control method further includes, in response to the first switch being triggered by a second condition, the microcontroller unit outputting a third control signal to the first latch, the third control signal being for instructing the first latch to stop outputting an enable signal to the voltage stabilizing device.

[0052] The microcontroller outputs a third control signal to the first latch, thereby controlling the first latch to disable the voltage stabilizing device, and the first voltage converter does not supply power to the isolated driving module. This control method is simple and reliable, which is advantageous for popularization and use in industrial applications.

[0053] Furthermore, the switch control method further includes, in response to the first switch being triggered by a second condition, the microcontroller unit outputting a fourth control signal to the second latch, the fourth control signal being for instructing the second latch to stop outputting the enable signal and turn off the third switch.

[0054] The microcontroller sends a fourth control signal to the second latch, which controls the second latch to prevent the third switch from being turned on, and the second voltage converter from supplying power to the isolated driving module. This control method is simple and reliable, which is advantageous for widespread use in industrial applications. Furthermore, since the second switch is turned off under the control of the microcontroller, the microcontroller can save data before turning it off, reducing the risk of data loss.

[0055] An embodiment of the present application provides a battery system including a battery, a power supply module, and a battery management system as described in claim 21 or 22, wherein the battery and the power supply module are electrically connected by the second switch, and in response to the second switch being turned on, the battery supplies power to the battery management system via the power supply module.

[0056] An embodiment of the present invention further provides an electrical installation including a load and the battery system described above, wherein the battery system supplies power to the load. [Brief explanation of the drawings]

[0057] In order to more clearly describe the embodiments of the present application, the following provides a brief description of the drawings required for the embodiments of the present application. It should be understood that the following drawings are only intended to illustrate some embodiments of the present application and should not be considered limiting in scope. [Figure 1] FIG. 1 is a schematic diagram showing the basic configuration of a switch circuit provided in an embodiment of the present invention. [Figure 2] FIG. 2 is a schematic diagram showing a more specific configuration of a switch circuit provided in an embodiment of the present invention. [Figure 3] FIG. 3 is a schematic diagram showing another more specific configuration of a switch circuit provided in an embodiment of the present invention. [Figure 4] FIG. 4 is a schematic diagram of the connection configuration between the switch circuit, the battery, and the power supply module provided in the embodiment of the present application. [Figure 5] FIG. 5 is a schematic diagram of a switch circuit having a voltage stabilizing device according to an embodiment of the present invention as shown in FIG. [Figure 6] FIG. 6 is a schematic diagram of a switch circuit having the first latch provided in the embodiment of the present invention in FIG. [Figure 7] FIG. 7 is a schematic diagram of a switch circuit having a redundant circuit provided in an embodiment of the present invention. [Figure 8] FIG. 8 is a schematic diagram of a switch circuit having the third switch provided in the embodiment of the present invention shown in FIG. [Figure 9] FIG. 9 is a schematic diagram of a switch circuit having the second latch provided in the embodiment of the present invention shown in FIG. [Figure 10] FIG. 10 is a schematic diagram showing the configuration of a switch circuit that can be turned on by an external power source, provided in an embodiment of the present invention. [Figure 11] FIG. 11 is a schematic diagram of a switch circuit equipped with a charging module provided in an embodiment of the present invention. [Figure 12] FIG. 12 is a schematic diagram of a switch circuit provided with a current-limiting resistor according to an embodiment of the present invention. [Figure 13] FIG. 13 is a schematic diagram of a switch circuit provided with a fuse according to an embodiment of the present invention. [Figure 14] FIG. 14 is a flow diagram of the switch control method provided in the embodiment of the present application. [Figure 15] FIG. 15 is a schematic diagram showing the configuration of a specific battery system provided in an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0058] The following detailed description will be given of the embodiments of the technical solution of the present application with reference to the drawings. Of course, the described embodiments are only a part of the embodiments of the present application, and are not all of the embodiments. The following embodiments are provided as examples to more clearly explain the technical solution of the present application, and are not intended to limit the scope of protection of the present application. Those skilled in the art will understand that the following embodiments and features in the embodiments may be combined with each other unless contradictory.

[0059] In the description of the embodiments of the present application, the term "and / or" is merely a relational expression representing related objects, and may represent three relationships. For example, A and / or B may represent three situations: A exists alone, A and B exist simultaneously, or B exists alone. In this specification, the symbol " / " usually indicates that the related objects before and after it are in an "or" relationship. Unless otherwise clearly and specifically limited, "plurality" means two or more.

[0060] In the description of the embodiments of the present application, unless otherwise clearly specified or limited, the technical term "electrical connection" may refer to a direct electrical connection or an indirect electrical connection via an intermediate medium. Those skilled in the art may understand the specific meaning of the above term in the embodiments of the present application according to the specific circumstances.

[0061] Current battery systems typically manage power on / off using circuit breakers or other controls. However, to avoid accidents, circuit breakers or breakers require manual operation by specialized maintenance personnel and are not permitted to be operated by ordinary users. This increases maintenance costs and makes control inconvenient. Furthermore, power shutdown by a circuit breaker or breaker is considered a forced power shutdown. When a power shutdown occurs, the battery management system in the battery system is forced to shut down, which means that the battery management system is unable to record running data in time, resulting in the loss of running data.

[0062] Therefore, the present embodiments provide a switch circuit, a battery management system, a switch control method, a battery system, and electrical equipment, which address at least some of the above-mentioned problems. Specifically, in the switch circuit provided in the present embodiments, a first switch connects a power source to an isolated driving module. The power source supplies power to the isolated driving module so that the isolated driving module is in an operating state. A voltage for controlling the second switch is output by the isolated driving module, thereby controlling the second switch. This allows the power source of the battery system to be turned on and off by controlling the first switch. Because the first switch and the second switch are isolated by the module, when the second switch is connected to a battery, the impact of the battery voltage on the first switch is reduced. Therefore, a general switch device (e.g., a tactile switch) can be used as the first switch. Compared to a circuit breaker or a circuit breaker, the first switch can be operated by a general user, reducing maintenance costs and improving control convenience. In some embodiments of the present application, the microcontroller unit further realizes off control of the second switch, which can alleviate the problem of running data being lost when the battery management system is unable to record the running data in time when power is interrupted.

[0063] FIG. 1 is a basic structural diagram of a switch circuit provided in an embodiment of the present application, which includes a power supply, a first switch K1, an isolated driving module, and a second switch K2.

[0064] In some embodiments of the present application, the power source is a device installed within the switch circuit and capable of providing electrical energy, and may include, but is not limited to, one or more of devices such as a supercapacitor, a button battery, etc. In some embodiments of the present application, the number of power sources may be one or more. When there are multiple power sources, the types of the power sources may be the same or different. Each power source may be connected in parallel between the first end of the first switch K1 and ground. For example, as shown in FIG. 2, the power source may include a supercapacitor and a button battery connected in parallel.

[0065] 1, the first end of the first switch K1 is electrically connected to the power supply, and the second end of the first switch K1 is electrically connected to the input end of the isolated driving module. When the first switch K1 is turned on, the power supply can supply power to the isolated driving module.

[0066] In the present embodiment, the first switch K1 may be a button type, and when the first switch K1 is pressed, the first switch K1 can be turned on. The first switch K1 may further have a characteristic that the first switch K1 bounces back and returns to an off state after the external force for pressing it is released. For example, to facilitate user operation, a tactile switch (also called a button switch) may be used as the first switch K1, but the present invention is not limited thereto.

[0067] In this embodiment, the control terminal of the second switch K2 is electrically connected to the output terminal of the isolated driving module, and the second switch K2 is configured to be turned on and off in response to the output signal of the isolated driving module.

[0068] In this embodiment, the second switch K2 may be realized by, but is not limited to, a FET, an IGBT, a relay, a photocoupler, or a transistor, where the FET may be, but is not limited to, a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor), an optical MOS, a gallium nitride FET, etc.

[0069] In this embodiment, as shown in Figure 3, the isolated driving module may include a second isolated power supply and an isolated driving chip. The input terminal of the second isolated power supply and the input terminal of the isolated driving chip together constitute the input terminal of the isolated driving module and are electrically connected to the second terminal of the first switch K1. The output terminal of the second isolated power supply is electrically connected to the power supply terminal VDD of the isolated driving chip to provide the isolated driving chip with a voltage that can drive its operation. The output terminal Vout of the isolated driving chip is electrically connected to the control terminal of the second switch K2 as the output terminal of the entire isolated driving module, thereby realizing the on / off control of the second switch K2.

[0070] In this embodiment, the ground terminal of the second isolated power supply and the ground terminal VSS of the isolated driving chip are both electrically connected to the first terminal of the second switch K2.

[0071] In this embodiment, the second isolated power supply may include a second driver IC (a circuit or chip for providing drive) and a second transformer B2. The second driver IC is electrically connected to the primary side of the second transformer B2 to provide the second transformer B2 with a drive voltage greater than a voltage threshold. The voltage threshold may be set according to the needs of the circuit, for example, 3.3 volts or 5 volts. The output terminal of the secondary side of the second transformer B2 is electrically connected to the power supply terminal VDD of the isolated driver chip to provide the isolated driver chip with a voltage sufficient to drive its operation. The ground terminal of the secondary side of the second transformer B2 is electrically connected to the first terminal of the second switch K2.

[0072] In the present embodiment, the isolated driving chip (also referred to as isolated chip or isolated driving) is a chip with isolation and driving capabilities, which is obtained by combining a digital isolator and a driving chip.

[0073] In the present embodiment, in response to the first switch K1 being triggered and turned on by a first condition, the second switch K2 is turned on, the first condition instructing the battery system to power on, and / or in response to the first switch K1 being triggered by a second condition, the second switch K2 is turned off, the second condition instructing the battery system to power off.

[0074] In this embodiment, the first condition is for instructing the first switch K1 to turn on so as to power on the battery system. The first condition may be, but is not limited to, pressing the first switch K1 to trigger the first switch K1 to turn on, or pressing the first switch K1 for a first period to trigger the first switch K1 to turn on. The first period is equal to or longer than the time required to turn on the second switch K2, and may be set to, for example, 3 to 5 seconds.

[0075] In this embodiment, the second condition is for instructing the first switch K1 to turn off so as to power off the battery system. The second condition may be, but is not limited to, first pressing the first switch K1 to trigger the first switch to turn off, then releasing the external force, causing the first switch K1 to bounce back to the off state, pressing the first switch K1 again to continue for a second period, then releasing the external force, causing the first switch K1 to bounce back to the off state again. The second period may be set according to needs, for example, to 2 seconds. In some other embodiments, the second condition may be pressing the first switch K1 to continue for a second period, where the first period and the second period are set to different times.

[0076] In this way, the control of the first switch K1 realizes the on / off control of the second switch K2, thereby powering on and off the battery system. Furthermore, because the first switch K1 and the second switch K2 are isolated by the isolation drive module, when the above switch circuit is applied to a high-voltage energy storage system, only the second switch needs to be connected to the high-voltage battery, thereby reducing the impact of the battery voltage on the first switch K1. This allows a general switch device (e.g., a tactile switch) to be used as the first switch. Compared to a circuit breaker or a circuit breaker, the first switch can be operated by a general user, reducing maintenance costs and improving control convenience.

[0077] Preferably, as shown in Figure 3, the switch circuit may further include a first unidirectional conduction device DZ1. A first end of the first unidirectional conduction device DZ1 is electrically connected to a second end of the first switch K1, and the second end of the first unidirectional conduction device DZ1 is electrically connected to an input end of the isolation driving module, thereby reducing the risk of backflow of current between the first switch K1 and the isolation driving module. Preferably, the first unidirectional conduction device DZ1 can be, but is not limited to, a diode.

[0078] In this embodiment, the first terminal of the second switch K2 may be configured to electrically connect to the input terminal of the power supply module, and the second terminal of the second switch K2 may be configured to electrically connect to the positive terminal of the battery, as shown in Figure 4. In this way, when the second switch K2 is turned on, the power supply module can convert the voltage output by the battery into a power supply voltage for the switch circuit, thereby providing electrical energy to keep the second switch K2 turned on.

[0079] A power supply module is a device that converts AC or DC power into the required AC or DC power. In some specific embodiments of the present application, the power supply module may be an independent device, and the switch circuit may be configured on a printed circuit board independent of the power supply module, and the power supply module may be electrically connected to the printed circuit board by an electrical connection device (such as a harness, connector, or bus bar).

[0080] Preferably, in some embodiments of the present invention, the second switch K2 may be multiple (not shown), and the multiple second switches K2 are configured in parallel to access between the positive terminal B+ of the battery and the power supply module. Exemplarily, the first terminals of the second switches K2 are electrically connected to the input terminal of the power supply module, the second terminals of the second switches K2 are electrically connected to the positive terminal B+ of the battery, and the control terminals of the second switches K2 are electrically connected to the output terminal of the isolated driving module. In this way, the multiple second switches K2 are connected in parallel to share the current in the main circuit of the battery system, thereby reducing the risk of damage to the second switches K2.

[0081] In this embodiment, as shown in Figure 4, the switch circuit may further include a first voltage converter H1. The input terminal of the first voltage converter H1 is configured to be electrically connected to the output terminal of the power supply module, and the output terminal of the first voltage converter H1 is electrically connected to the input terminal of the isolated driving module. The first voltage converter H1 is configured to step down the output voltage of the power supply module. The first voltage converter H1 may be realized by, but is not limited to, a step-down circuit.

[0082] The first voltage conversion device H1 converts the voltage output from the power supply module into a voltage that can be input to the isolated driving module, and then turns the first switch K1 off and drives the second switch K2 to turn on, thereby maintaining the battery system in a power-on state.

[0083] In some possible embodiments of the present application, as shown in FIG. 5 , the switch circuit may further include a voltage stabilization device H4. The voltage stabilization device H4 is electrically connected between the output terminal of the first voltage conversion device H1 and the input terminal of the isolated driving module. Preferably, the voltage stabilization device H4 may be a linear regulator, but is not limited to such a device. For example, an LDO (Low Dropout Regulator) may be used to stabilize the voltage input to the isolated driving module and reduce the risk of the second switch being turned off incorrectly due to voltage jitter. The voltage stabilization device H4 may be configured as a device or circuit that performs further conversion on the voltage output by the first voltage conversion device H1 to output a stable voltage (with small voltage fluctuations) that meets the needs of the isolated driving module.

[0084] 5, the switch circuit may further include a second unidirectional conduction device DZ2. A first end of the second unidirectional conduction device DZ2 is electrically connected to the output end of the voltage stabilizing device H4, and a second end of the second unidirectional conduction device DZ2 is electrically connected to the input end of the isolated driving module, thereby reducing the risk of reverse current flow between the voltage stabilizing device H4 and the isolated driving module. Preferably, the second unidirectional conduction device DZ2 can be, but is not limited to, a diode.

[0085] In some possible embodiments of the present application, as shown in Figure 6, the switch circuit may further include a first latch, wherein the input end of the first latch is configured to be electrically connected to the microcontroller unit, and the output end of the first latch is electrically connected to the enable pin of the voltage stabilization device H4.

[0086] In some embodiments of the present application, the microcontroller unit may be part of a BMS, and may be, but is not limited to, an MCU (Microcontroller Unit), a one-chip microcomputer, a microprocessor, or the like.

[0087] In this embodiment, the first latch is set to keep the voltage stabilizing device H4 operating, thereby maintaining the battery system in a power-on state. After the first switch K1 is triggered by the second condition, the microcontroller controls the first latch to stop outputting the enable signal, causing the voltage stabilizing device H4 to stop operating, and the first voltage converter H1 to stop supplying power to the isolated driving module, thereby realizing the off control of the second switch K2. Since the second switch K2 is turned off under the control of the microcontroller, the microcontroller saves data before turning it off, reducing the risk of data loss.

[0088] In some other embodiments of the present application, the output end of the first switch K1 may be further configured to be electrically connected to a microcontroller unit, and when the microcontroller unit is in a power-on state and the first switch K1 receives a signal that is triggered by a second condition to turn off, the microcontroller may control the first latch to stop outputting the enable signal.

[0089] In some possible embodiments of the present application, as shown in Figure 7, the switch circuit includes a first voltage converter H1 and may further include a second voltage converter H2. The input terminal of the second voltage converter H2 is configured to be electrically connected to the output terminal of the power supply module, and the output terminal of the second voltage converter H2 is electrically connected to the input terminal of the isolated driving module. The second voltage converter H2 is configured to step down the output voltage of the power supply module. The second voltage converter H2 may be realized by, but is not limited to, a step-down circuit.

[0090] A second voltage converter H2 is installed, and the input terminal of the second voltage converter H2 is electrically connected to the output terminal of the power supply module, and the output terminal of the second voltage converter H2 is electrically connected to the input terminal of the isolated driving module, thereby forming a redundant circuit that supplies power to other isolated driving modules. In this way, when the power supply circuit that supplies power to one of the isolated driving modules fails, the other power supply circuit can continue to operate normally, and the reliability of the switch circuit is further improved.

[0091] 7, the switch circuit may further include a third unidirectional conducting device DZ3. A first end of the third unidirectional conducting device DZ3 is electrically connected to the output end of the second voltage conversion device H2, and a second end of the third unidirectional conducting device DZ3 is electrically connected to the input end of the isolation driving module, thereby reducing the risk of backflow of current between the second voltage conversion device H2 and the isolation driving module. Preferably, the third unidirectional conducting device DZ3 can be, but is not limited to, a diode.

[0092] In some possible embodiments of the present application, as shown in Figure 8, the switch circuit may further include a third switch K3. A first end of the third switch K3 is configured to electrically connect to the output end of the power supply module, and a second end of the third switch K3 is electrically connected to the input end of the second voltage conversion device H2. The third switch K3 can control whether to turn on the redundant power supply circuit, making the switch circuit more controllable.

[0093] Preferably, in the present embodiment, the third switch K3 may be realized by an eFuse (one-time programmable memory), but is not limited thereto. For example, the third switch K3 may be realized by an FET, an IGBT, a photocoupler, or the like.

[0094] In some possible embodiments of the present application, as shown in FIG. 9 , the switch circuit may further include a second latch. The input terminal of the second latch is electrically connected to the microcontroller unit, and the output terminal of the second latch is electrically connected to the enable pin of the third switch K3. Setting the second latch keeps the third switch K3 on, thereby maintaining the battery system in a power-on state. After the first switch K1 is triggered by the second condition, the microcontroller unit controls the second latch to no longer output the enable signal, thereby turning off the third switch K3. This prevents the second voltage converter H2 from supplying power to the isolated driving module. In this embodiment, the second switch K2 is turned off under the control of the microcontroller unit, so that the microcontroller unit can save data before turning it off, reducing the risk of data loss.

[0095] In some other embodiments of the present application, the output end of the first switch K1 may be further configured to be electrically connected to a microcontroller unit, and when the microcontroller unit is in a power-on state and receives a signal indicating that the first switch K1 is triggered and turned off by a second condition, the microcontroller may control the second latch to stop outputting the enable signal.

[0096] In some possible embodiments of the present application, as shown in Figure 10, the switch circuit may further include a power supply connection terminal S, a third voltage conversion device H3, and a first isolated power supply. The power supply connection terminal S is configured to be electrically connected to an external power supply. The input end of the third voltage conversion device H3 is electrically connected to the power supply connection terminal S. The input end of the first isolated power supply is electrically connected to the output end of the third voltage conversion device H3, and the output end of the first isolated power supply is electrically connected to the input end of the isolated driving module.

[0097] The circuit can turn on the second switch K2 by accessing an external power source, while the first isolated power source can provide isolation between the external power source and each electronic device in the switch circuit, preventing the switch circuit from being burned out due to accessing an incompatible external power source.

[0098] The implementation structure of the first isolated power supply is similar to that of the second isolated power supply. The first isolated power supply may include a first driving IC (a circuit or chip for providing driving) and a first transformer B1. The first driving IC is electrically connected to the primary side of the first transformer B1 to provide the first transformer B1 with a driving voltage greater than a voltage threshold. The voltage threshold may be, but is not limited to, 3.3 volts or 5 volts. The output terminal of the secondary side of the first transformer B1 is electrically connected to the input terminal of the isolated driving module to output a voltage to the isolated driving module that meets the needs of the isolated driving module.

[0099] A so-called external power supply is further understood to be a power supply which is located outside the switch circuit relative to the switch circuit.

[0100] 10, the switch circuit may further include a fourth unidirectional conducting device DZ4. A first end of the fourth unidirectional conducting device DZ4 is electrically connected to the output end of the first isolated power source, and a second end of the fourth unidirectional conducting device DZ4 is electrically connected to the input end of the isolated driving module, thereby reducing the risk of backflow of current between the first isolated power source and the isolated driving module. Preferably, the fourth unidirectional conducting device DZ4 can be, but is not limited to, a diode.

[0101] In some possible embodiments of the present application, the switch circuit may further include a charging module, as shown in Figure 11. The input terminal of the charging module is electrically connected to the output terminal of the power supply module, and the output terminal of the charging module is electrically connected to the power supply. After the charging module is set up, the second switch K2 is turned on, allowing the power supply to be charged, and the first switch K1 continues to control the second switch K2 to be turned on.

[0102] In an exemplary embodiment, the input terminal of the charging module is electrically connected to the output terminal of the power supply module in a specific manner such that the input terminal of the charging module is electrically connected to at least one output terminal from the first voltage converter H1, the second voltage converter H2, and the third voltage converter H3, so that the charging module is electrically connected to the output terminal of the power supply module via at least one of the first voltage converter H1, the second voltage converter H2, and the third voltage converter H3, and can obtain a voltage that meets the charging needs of the power supply.

[0103] In another exemplary embodiment, the input terminal of the charging module is electrically connected to the output terminal of the power supply module by electrically connecting the input terminal of the charging module to the output terminal of the fourth voltage converter. The fourth voltage converter is a voltage converter independent of the first voltage converter H1, the second voltage converter H2, and the third voltage converter H3.

[0104] In some possible embodiments of the present application, as shown in Figure 12, the switch circuit may further include a current-limiting resistor R. The current-limiting resistor R is configured to be connected in series between the battery and the power supply module. The installation of the current-limiting resistor R can reduce the probability of an excessive current being generated after the battery is connected to the power supply module, causing damage to an electronic device (for example, burning out the second switch K2), thereby improving the safety of the switch circuit.

[0105] In some possible embodiments of the present application, the switch circuit may further include a fuse D. By disposing the fuse D in the charge path and / or discharge path of the battery system, the risk of the battery system being burned out is reduced and the safety of the battery system is improved. For example, as shown in FIG. 13, the fuse D may be disposed between the battery positive terminal and the second switch K2.

[0106] 13, the switch circuit may further include a fifth unidirectional conducting device DZ5. A first end of the fifth unidirectional conducting device DZ5 is electrically connected to a first end of the second switch K2, and a second end of the fifth unidirectional conducting device DZ5 is electrically connected to an input end of the power supply module, thereby reducing the risk of backflow of current between the second switch K2 and the power supply module. Preferably, the fifth unidirectional conducting device DZ5 may be, but is not limited to, a diode.

[0107] Based on the same inventive idea, the present embodiment further provides a BMS, which includes the switch circuit provided in the present embodiment.

[0108] The BMS may further include a microcontroller. When the switch circuit includes a first voltage converter, a first latch, and / or a second latch, the power pin of the microcontroller may be electrically connected to the output terminal of the first voltage converter H1. The microcontroller may further be electrically connected to the input terminal of the first latch, and / or the microcontroller may further be electrically connected to the input terminal of the second latch.

[0109] Based on the same inventive idea, the present embodiment further provides a switch control method applied to the above-mentioned BMS. As shown in Figure 14, the method includes the following steps:

[0110] S1401: In response to the first switch K1 being triggered by a first condition, the power supply supplies power to the isolated driving module, where the second switch K2 is turned on in response to the output signal of the isolated driving module.

[0111] In this embodiment, when the power pin of the microcontroller unit is electrically connected to the output terminal of the first voltage conversion device H1 and the microcontroller unit is electrically connected to the input terminal of the first latch, the switch control method further includes the microcontroller unit outputting a first control signal to the first latch in response to the second switch K2 being turned on, where the first control signal is for instructing the first latch to output an enable signal to the voltage stabilizing device H4, so that the first voltage conversion device H1 supplies power to the isolated driving module through the voltage stabilizing device H4.

[0112] Since the microcontroller unit does not usually have its own power supply, unless the second switch K2 is turned on, the microcontroller unit is in a power-off state. After the second switch K2 is turned on, the battery supplies power to the microcontroller unit through the power supply module, causing the microcontroller unit to be powered on and outputting the first control signal to the first latch.

[0113] Because the data in the latch can be maintained unchanged, after the microcontroller unit outputs the first control signal to the first latch, the first latch continues to output an enable signal to the voltage stabilizing device H4, so that the first voltage conversion device H1 continues to power the isolated driving module through the voltage stabilizing device H4, and the second switch K2 can continue to be on even after the first switch K1 is turned off.

[0114] In this embodiment, the microcontroller is further electrically connected to the output terminal of the first switch K1. When the microcontroller is in a power-on state, if the first switch K1 is triggered by a second condition and a signal to turn off is monitored, the microcontroller outputs a third control signal to the first latch, which instructs the first latch to stop outputting the enable signal to the voltage stabilizing device H4.

[0115] If there is no second latch in the switch circuit, after the microcontroller unit outputs the third control signal to the first latch, the voltage stabilizing device H4 stops working, so that the isolated driving module has no input voltage and no longer outputs a control signal to turn on the control end of the second switch K2, so that the second switch K2 turns off.

[0116] When the microcontroller is electrically connected to the input terminal of the second latch, the switch control method further includes the microcontroller outputting a second control signal to the second latch in response to the second switch K2 being turned on, the second control signal being for instructing the second latch to output an enable signal to the third switch K3, so that the third switch K3 is turned on and the second voltage conversion device H2 supplies power to the isolated driving module.

[0117] Since the data in the latch can be maintained unchanged, after the microcontroller unit outputs the second control signal to the second latch, the second latch continues to output an enable signal to the third switch K3, so that the second voltage conversion device H2 continues to supply power to the isolated driving module, and the second switch K2 can continue to be on after the first switch K1 is turned off.

[0118] Furthermore, when the microcontroller is further electrically connected to the input terminal of the second latch, the switch control method further includes the microcontroller outputting a fourth control signal to the second latch in response to the first switch K1 being triggered and turned on by the second condition, where the fourth control signal is for instructing the second latch to stop outputting the enable signal and turn off the third switch K3.

[0119] The microcontroller controls the voltage stabilizing device H4 to stop operating, and after the third switch K3 is turned off, the isolated driving module no longer receives the input voltage, and no longer outputs a control signal to the control end of the second switch K2 to turn it on, turning off the second switch K2.

[0120] The BMS may include more components, for example, the BMS may include a data acquisition chip (such as an AFE (Analog Front End) chip) to acquire battery information (such as voltage, temperature, etc.).

[0121] Based on the same inventive idea, an embodiment of the present application provides a battery system including a battery, a power module, and the aforementioned BMS, wherein the battery and the power module are electrically connected by a second switch K2, and the battery can supply power to the battery management system via the power module in response to turning on the second switch K2.

[0122] The battery described in the present embodiment is composed of multiple battery cells, and the multiple battery cells may be connected directly, in parallel, or in series-parallel. A series-parallel connection includes both direct and parallel connections between multiple battery cells. It is understood that a battery may include multiple battery cells connected directly, in parallel, or in series-parallel to form a battery set, and then multiple battery sets are connected directly, in parallel, or in series-parallel to form an integrated battery. The battery may include other structures, such as bus components, that realize electrical connections between multiple battery cells. In the present embodiment, the battery cells may be secondary batteries, including, but not limited to, lithium-ion batteries, sodium-ion batteries, magnesium-ion batteries, or solid-state batteries. In the present embodiment, the battery cells may be cells or battery entities including cells, but are not limited thereto.

[0123] In the present embodiment, the battery system may be, but is not limited to, a high-voltage energy storage system, a vehicle power supply system, a battery pack, etc. The so-called high-voltage energy storage system is a system in which the output voltage of the battery is greater than 60V.

[0124] To facilitate understanding of the technical solutions of the embodiments, the following description will use the circuit shown in Figure 15 as an example to illustrate the technical solutions of the embodiments. Here, the power supply can be a parallel-connected supercapacitor and a button battery, the power supply module can be a 24V / 12V DC / DC (direct current to direct current) power supply module, the first switch K1 can be a tactile switch, the second switch K2 can be an NMOS tube, the first voltage converter H1 can be a voltage converter circuit that converts 24V / 12V to 5.5V, the second voltage converter H2 can be a voltage converter circuit that converts 24V / 12V to 5V, the voltage stabilizing device H4 can be an LDO, the third switch K3 can be an eFuse, the third voltage converter H3 can be a voltage converter circuit that converts 12V to 5V, and the first unidirectional conducting devices DZ1 to DZ5 can all be diodes. The circuit structure is shown in Figure 15. The first switch K1 has a characteristic that it bounces back and returns to its OFF state after the external force pressing it is released. The first switch K1 is installed on the external panel of the battery system to facilitate user operation.

[0125] To power on the battery system, a user presses the first switch K1 and holds it for a certain period of time (e.g., 3 to 5 seconds). The supercapacitor and button battery output a voltage to the isolated driving module, and the output terminal of the isolated driving module outputs a voltage to the gate of the second switch K2, turning on the second switch K2. The battery supplies power to the power supply module via a fuse D, the second switch K2, and a current-limiting resistor R. The power supply module converts the battery voltage to a low voltage of 24V or 12V, then further reduces the voltage to 5.5V using a first converter and outputs a voltage to the MCU to wake up the MCU. Alternatively, the 5.5V voltage is reduced to 5V or 3.3V using a voltage converter circuit or device and outputs a voltage to the MCU (not shown) to wake up the MCU. The first converter outputs the 5.5V voltage to the LDO. The MCU outputs a first control signal to the first latch, causing the first latch to continue outputting an enable signal to the LDO, enabling the LDO to operate. This allows power to be continuously supplied to the isolated driving module, and even after the external force is released and the first switch K1 is turned off, the isolated driving module can continue to supply power to the gate of the second switch K2, keeping the second switch K2 on. Meanwhile, the MCU outputs a second control signal to the second latch so that the eFuse continues to transfer the voltage output from the power supply module to the second conversion device. The second conversion device reduces the voltage to 5V and outputs it to the isolated driving module. This allows power to be continuously supplied to the gate of the second switch K2, keeping the second switch K2 on, even after the external force is released and the first switch K1 is turned off. At the same time, the voltage output from the power supply module is used by the charging module to charge the supercapacitor and button battery.

[0126] Alternatively, a user may access an external power source through the power connection terminal S to power up the battery system from an external power source. After the power connection terminal S accesses the external power source, the third voltage converter H3 converts the voltage from the external power source to 5V and outputs it to the isolated driving module through the first isolated power source. In this case, the output terminal of the isolated driving module outputs a voltage to the gate of the second switch K2, turning on the second switch K2. The battery supplies power to the power module through a fuse D, the second switch K2, and a current-limiting resistor R. The power module converts the battery voltage to a low voltage of 24V or 12V, and then further reduces the voltage to 5.5V through the first converter and outputs it to the MCU to wake up the MCU. Alternatively, the 5.5V voltage is reduced to 5V or 3.3V through a voltage conversion circuit or device and output to the MCU (not shown) to wake up the MCU, and the first converter outputs the 5.5V voltage to the LDO. The MCU outputs a first control signal to the first latch to operate the LDO, causing the first latch to continue outputting an enable signal to the LDO. This allows power to be continuously supplied to the isolated driving module. Even after the external force is removed and the first switch K1 is turned off, the isolated driving module continues to supply power to the gate of the second switch K2, allowing the second switch K2 to remain on. Meanwhile, the MCU outputs a second control signal to the second latch to allow the eFuse to continue transferring the voltage output from the power module to the second converter. The second converter reduces the voltage to 5V and outputs it to the isolated driving module. This allows the isolated driving module to continue supplying power to the gate of the second switch K2, allowing the second switch K2 to remain on, even after the external force is removed and the first switch K1 is turned off. At the same time, the voltage output from the power module is used by the charging module to charge the supercapacitor and button battery.

[0127] To power off the battery system, the user presses the first switch K1 for a certain period of time (e.g., 3 seconds). After the MCU detects a voltage signal output from the output terminal of the first switch K1 that lasts for a certain period of time, the MCU outputs a third control signal to the first latch, causing the first latch to stop outputting an enable signal to the LDO. After this, the LDO stops operating, and the first voltage converter H1 is no longer able to supply power to the isolated driving module. Meanwhile, the MCU outputs a fourth control signal to the second latch, causing the second latch to stop outputting an enable signal to the eFuse. After this, the eFuse no longer transfers the voltage output from the power module to the second converter H2, preventing the isolated driving module from obtaining electrical energy. The external force is then removed, and the first switch K1 is turned off. When the first voltage converter H1 cannot supply power to the isolated driving module, the second converter H2 cannot supply power to the isolated driving module, and the first switch K1 is turned off, the isolated driving module has no electrical energy source, stops supplying power to the gate of the second switch K2, and the second switch K2 is turned off, completing the power off of the battery system.

[0128] The above technical solution for turning off the first switch K1 by automatically bouncing back after the external force pressing it is released is merely an example of an embodiment of the present application, and other operations for turning off the first switch K1 may be set according to specific needs.

[0129] The technical solution provided in the embodiment of the present application allows the user to control the power on / off of the battery system by operating the first switch K1, which reduces the operation requirements, reduces maintenance costs, and improves control convenience. At the same time, because the power off of the battery system is realized by the microcontroller unit, the microcontroller unit can save the execution data before powering off the battery system, thereby reducing the risk of data loss.

[0130] In the present embodiment, the electronic devices electrically connected to the input terminal of the isolated driving module by the switch circuit, such as the first switch, the first voltage converter, the second voltage converter, the third voltage converter, the voltage stabilizing device, the first latch, the second latch, the power supply, the charging module, and the third switch, may be configured on one or more circuit boards, and the isolated driving module, the second switch, the fuse D, and the current-limiting resistor R may be configured on another circuit board or boards, thereby realizing isolation on the circuit boards and further improving the safety of the battery system.

[0131] Based on the same inventive idea, the present embodiment further provides an electrical installation, including a load and a battery system provided in the present embodiment, wherein the battery system supplies power to the load.

[0132] The electric equipment provided by the embodiments of the present application includes, but is not limited to, electric trains, electric cars, steamships, electric two-wheeled vehicles (such as electric scooters and electric bicycles), electric motorcycles, electric tricycles, and the like.

[0133] The above-described embodiments are merely exemplary and illustrative examples of the present application, and do not limit the scope of protection of the present application. Those skilled in the art can appreciate that the present application may have various modifications and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application are included in the scope of protection of the present application.

Claims

1. A switch circuit including a power supply, a first switch, an isolated driving module, and a second switch, a first end of the first switch is electrically connected to the power source, and the first switch is a tactile switch; a second end of the first switch is electrically connected to an input end of the isolated driving module, and the power source is configured to power the isolated driving module through the first switch; a control end of the second switch is electrically connected to an output end of the isolation driving module, and the second switch is configured to be turned on and off in response to an output signal of the isolation driving module; the second switch is turned on in response to the first switch being triggered by a first condition, the first condition being for instructing the battery system to power on; and / or the second switch is turned off in response to the first switch being triggered by a second condition, the second condition being for instructing the battery system to power off; a first end of the second switch is configured to electrically connect to an input end of a power supply module, and a second end of the second switch is configured to electrically connect to a positive terminal of a battery; the switch circuit further includes a first voltage conversion device; The input terminal of the first voltage conversion device is configured to be electrically connected to the output terminal of the power supply module, and the output terminal of the first voltage conversion device is electrically connected to the input terminal of the isolated driving module; the first voltage conversion device is configured to step down the output voltage of the power supply module; Switch circuit.

2. the switch circuit further includes a first unidirectional conducting device; a first end of the first one-way conducting device electrically connected to a second end of the first switch, and a second end of the first one-way conducting device electrically connected to an input end of the isolated driving module; The switch circuit according to claim 1 .

3. the switch circuit further includes a voltage stabilization device; The voltage stabilizing device is electrically connected between the output terminal of the first voltage conversion device and the input terminal of the isolated driving module; The switch circuit according to claim 1 .

4. the switch circuit further includes a first latch; an input end of the first latch is configured to be electrically connected to a microcontroller unit, and an output end of the first latch is electrically connected to an enable pin of the voltage stabilizing device; The switch circuit according to claim 3 .

5. the switch circuit further includes a second unidirectional conducting device; a first end of the second unidirectional conduction device electrically connected to the output end of the voltage stabilizing device, and a second end of the second unidirectional conduction device electrically connected to the input end of the isolated driving module; The switch circuit according to claim 3 .

6. the switch circuit further includes a second voltage conversion device; The input terminal of the second voltage conversion device is configured to be electrically connected to the output terminal of the power supply module, and the output terminal of the second voltage conversion device is electrically connected to the input terminal of the isolated driving module; the second voltage conversion device is configured to step down the output voltage of the power supply module; 5. The switch circuit according to claim 4.

7. the switch circuit further includes a third switch; a first end of the third switch is configured to be electrically connected to the output end of the power supply module, and a second end of the third switch is electrically connected to the input end of the second voltage conversion device; 7. The switch circuit according to claim 6.

8. the switch circuit further includes a second latch; an input end of the second latch is configured to be electrically connected to a microcontroller unit, and an output end of the second latch is electrically connected to an enable pin of the third switch; The switch circuit according to claim 7 .

9. the switch circuit further includes a third unidirectional conducting device; a first end of the third unidirectional conducting device electrically connected to the output end of the second voltage converting device, and a second end of the third unidirectional conducting device electrically connected to the input end of the isolated driving module; 7. The switch circuit according to claim 6.

10. the switch circuit further includes a power supply connection terminal, a third voltage conversion device, and a first isolated power supply; The power supply connection terminal is configured to be electrically connected to an external power supply, an input terminal of the third voltage conversion device is electrically connected to the power supply connection terminal; The input terminal of the first isolated power supply is electrically connected to the output terminal of the third voltage conversion device, and the output terminal of the first isolated power supply is electrically connected to the input terminal of the isolated driving module; The switch circuit according to claim 1 .

11. the switch circuit further includes a fourth unidirectional conducting device; a first end of the fourth unidirectional conducting device electrically connected to the output end of the first isolated power source, and a second end of the fourth unidirectional conducting device electrically connected to the input end of the isolated driving module; The switch circuit according to claim 10.

12. the switch circuit further includes a charging module; The input end of the charging module is electrically connected to the output end of the power supply module, and the output end of the charging module is electrically connected to the power supply; The switch circuit according to claim 1 .

13. the switch circuit further includes a current-limiting resistor; The current limiting resistor is connected in series between the battery and the power supply module. The switch circuit according to claim 1 .

14. the switch circuit further includes a fuse; The fuse is disposed in a charge path and / or a discharge path of the battery system. The switch circuit according to claim 1 .

15. The power source includes a supercapacitor and / or a button cell battery. The switch circuit according to claim 1 .

16. the second switch is any one of a field effect transistor, an insulated gate bipolar transistor, a relay, a photocoupler, and a transistor; The switch circuit according to claim 1 .

17. The isolated driving module includes a second isolated power supply and an isolated driving chip; The input end of the isolated driving module includes the input end of the second isolated power supply and the input end of the isolated driving chip, and the output end of the isolated driving module includes the output end of the isolated driving chip; The output terminal of the second isolated power supply is electrically connected to the power supply terminal of the isolated driving chip; The switch circuit according to claim 1 .

18. The ground terminal of the second isolated power supply and the ground terminal of the isolated driving chip are both electrically connected to the first terminal of the second switch; 18. The switch circuit according to claim 17.

19. A switch circuit comprising the switch circuit according to any one of claims 1 to 18. Battery management system.

20. A battery management system including the switch circuit of claim 8 and a microcontroller unit, The power pin of the microcontroller unit is electrically connected to the output terminal of the first voltage conversion device; Battery management system.

21. A switch control method applied to the battery management system according to claim 19, in response to the first switch being triggered by a first condition, the power source powers the isolated drive module; the second switch is turned on in response to the output signal of the isolated driving module; Switch control method.

22. A switch control method applied to the battery management system according to claim 20, comprising: The method includes, in response to the first switch being triggered by a first condition, the power source powering the isolated drive module; the second switch is turned on in response to the output signal of the isolated driving module; The method further includes, in response to the second switch being turned on, the microcontroller unit outputting a first control signal to the first latch; the first control signal is for instructing the first latch to output an enable signal to the voltage stabilization device so that the first voltage conversion apparatus supplies power to the isolated driving module through the voltage stabilization device; Switch control method.

23. The method comprises: In response to the second switch being turned on, the microcontroller unit further outputs a second control signal to the second latch; The second control signal is for instructing the second latch to output an enable signal to the third switch so that the third switch is turned on and the second voltage conversion device supplies power to the isolated driving module.

23. The switch control method of claim 22.

24. The method comprises: In response to the first switch being triggered under a second condition, the microcontroller unit further outputs a third control signal to the first latch; the third control signal is for instructing the first latch to stop outputting an enable signal to the voltage stabilization device; 23. The switch control method of claim 22.

25. The method comprises: In response to the first switch being triggered under a second condition, the microcontroller unit further includes outputting a fourth control signal to the second latch; the fourth control signal is for instructing the second latch to stop outputting the enable signal and turn off the third switch; 23. The switch control method of claim 22.

26. a battery; a power supply module; and the battery management system of claim 19; the battery and the power supply module are electrically connected by the second switch; In response to the second switch being turned on, the battery supplies power to the battery management system via the power supply module. Battery system.

27. a load; and the battery system of claim 26, the battery system powers the load; Electrical equipment.

Images